CTMS clients should use only one hard-coded URL: the URL of the CTMS registry. Starting with the information in the CTMS registry, clients can then navigate through the entire API by following link rels. Using the CTMS Registry as a Client shows how to query the CTMS registry.
The CTMS registry may contain the following link rels. Not all link rels are available in all installations. The CTMS registry may also contain other link rels.